[Kadelake]

Dust to Dust works against Tartarians. I lost some tartarians to heavy DtD spamming in my first game. It takes quite a large number of mages to be able to land enough hits so that it doesn't just regenerate back to full health. What probably brought the tartarians down was the afflictions. Since DtD does a lot of damage in one hit the chance for afflictions is quite high and after a few rounds they really started to pile up.

I think your problem is that your spells doesn't hit the target. Have you tried casting wind guide first?